Gatwick aims to be carbon neutral by the spring.
The airport has joined more than 80 global companies in a programme designed to generate a “massive increase” in the demand for renewable electricity.
Gatwick said it has been purchasing 100 per cent renewable electricity since 2013 and is one of three new companies to join the RE100 alliance in an announcement made during the World Economic Forum meeting in Davos.
The airport’s use of 100 per cent renewable electricity is a key part of the airport becoming carbon neutral later this year, as electricity comprises 80 per cent of the airport’s operational carbon footprint.
Gatwick’s CEO, Stewart Wingate, said: “The initiatives announced today are important milestones in Gatwick’s journey to become the UK’s most sustainable airport and one of the greenest in the world.
“We are serious about growing sustainably and we have some ambitious plans to develop in the most environmentally responsible way possible. We expect to see our world first waste plant generating heat for our North Terminal this year and we are introducing an electric car sharing service, the first of its kind for a UK airport.
“A set of rigorous environmental targets is driving our overall environmental performance and, despite a dramatic increase in our passenger numbers, I’m delighted to say that our environmental footprint is the same or better today than it was in the early 1990s despite our passenger numbers doubling.”